Expansion rock-anchorage.



l; No. 859,532 Y PATNNT'ED JULY 9, 19o?.

G. P. SWCNTFIGNN. EXPANSION RQGNANGNONNGB. PPIYIATION FILED MAY l, 1905.

UNITED STATES .PATENT Omron;

EXPANSION ROCK-ANCHORAGE.

yNo. 859,532,

Specification of Letters Patent.

:Patented July 9, 19o?.v

Application filed May 1, 1905. Serial No. 258,403.

To all whom it may concern.;

Be it known that I, G iconos F. Swon'rrir: nu. a eii izen of the United `Stat-es, and resident ol' Newark, in the county of Essex land State ol' N ew Jersey. have invented a certain new and useful Expansion ltoekhnchoe age, o Which-the followingr is n specification4 This invention relates to the securing ol' .st-nys. guys. the.; tosolid bodies; and hasl'or its object nu :uu-horage that can be easily applied und secured iu holes iu briclr work, timbers, rock, dsc. and one ihn( muy also be easily released from their hold.

The objects are attained by the means ser forth iu these specifications and the accompanying drawings. inwhich like letters refer tosimilnr parts throughout the several views.

Figure I is aside view of thc anchor. Fig. ll is nu edge view of the same. Fig. lll a view of. the bolt end of the anchor7 with the eye removed from the bolt.

Fig: 1V is a view of the'butt-eudof the nui-hor. Fi'g. V

represents the anchor in use.

The anchor consists of a pronged piece a mode of malleable iron or steel, its outer shape conforming to that of a cylinder with opposite sides cut away7 as in Figs. IV and V. The prongs nre solidly united at one end. The ends of the prongs .ue of lurger diametery than the butt-end onf.y und the enlargement is crossscored to afford projecting points rl. (l, that will fall into irregularities in reeks or pressinto the liber of wood. v

Whenan anchor has been set l'or temporary use, or as often happens, an anchor is to be abandoned the extreme ends oi' the prongs l.. l. nreprovided with iuward-ly projecting flanges I, l@ Figs. I and lll. and `tney partly surround the bolt b. as shown in Fig. lll. At theI butt end of the anchor is a space to receive a Init v f: through whit-litho bolt h secured. From a point just forward oi the nut, extending to the flanges l, l,

vthe inner surfaces of the-prongs are llat7 and constitute inclined planes m, nl., gradually sloping towards thc bolt and to the iangcs l, P. The flanges prevent the nut from being entirely drawn out oi the anchor', and

when the bolt is in place with its point in the recess c, Fig. I, the bolt encircling flanges retain the anchors so that it cannot become separated from the bolt in bundling it, singly or in bolt. When the bolt b is .screwed into the nut c, the nut will not-move until the point ol the screw impinges against the bottom of the countersinl ej. Then as the bolt continues-to be turned the nut will move upon the inclined surfaces nl. m. causing the prongs l., l, lo expand against the surrounding material.

iu Fig.' V the operation is illustrated4 A bolt r1. is bored in the rock r lurgeenough to admit the nnchor a. As the bolt is turned the anchor is expanded against the rock, the pointsl (l, d, taking hold uponv the surrounding stone. The harder the bolt is turned, or thc gre-eter the strain .put upon the anchor the' tighter will the anchor becomeby reason of the action ol the nut on the inclined plnnes.

Having described my invention. what l claim und desire to secure by LettersPntcut, is

1. A rock anchor compi ising Iwo prongs ini'cgrllly counected ut their buses. n spore between lbe prongs nt' the buse udnpted l'or n square nul for bolt. the prongs open nt the sides the sume uren ns the space between them [or und toudmil the uni to the nut-space, prongs inpering nu'urdliY from the nut-space to their outer ends. their outer ends provided withllnnges to pnl-tlv encircle the bolt. und having curved and serrated outer l'nces for engagement with the Walls of n hole in the rock.

2. ln n rock nnchor, the combinoiion with mi anchorbolt having n square nul on its threaded end, of a member comprising two prongs integrally connected nt 'their bases. a spncehetween the prongs nt uren ns the 'sp-.ice between them for elasticity und to nd mit the nut of the boli'. the prongs tnpering from the nutspuce to their outer ends, the .suid ends having llunges to partly encrl'le the bolt. und outer l'nces curved und serrnted tondzipt them to the wulls of :t hole in the rock.

Signed al Newark in the count),v of Essex und Si'ntcbi New .lei selv this iwenty ifih doy of March A. l). 1905.

lll-lillitil F. Sl'VOR'lFlGEIt.'

Wiinesse Arrrnrfl: S. Dit von, llico. A. 'l.\r.r.o'r;

the buse to receive. the nut of lhe bolt1 the prongs openl :it their sides the saune 

